Observationally, massive prestellar cores such as those adopted as initial conditions in the aforementioned simulations have proven elusive [1]}. Among the longest-standing candidates is G11.92\(-\) 0.61 MM2 (hereafter MM2): the second-brightest millimeter continuum core in the G11.92\(-\) 0.61 protocluster [2]}, [3]}. MM2 was identified as a candidate massive prestellar core based on its lack of molecular line emission and other star formation indicators in Submillimeter Array (SMA) and Karl G. Jansky Very Large Array (VLA) observations [4]}.
MM2 is only \(\sim \) 72 (0.12 pc) from G11.92\(-\) 0.61-MM1, a proto-O star with a fragmented Keplerian disk [5]}, [6]}; as in [4]}, [3]}, here we adopt \(d_{\rm MM2}\) =3.37\(^{+0.39}_{-0.32}\)  kpc, the maser parallax distance for MM1 [9]}.
From the SMA dust continuum, [4]} estimated that MM2's mass is M\(\gtrsim \) 30 M\(_{\odot }\)  within a radius \(<\) 1000 au.
